<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <script>
    switch (90) {
      case 1 :
        alert('找到了一号')
        break
        case 2 :
        alert('找到了二号')
        break
        case 3 :
        alert('找到了三号')
        break
        case 4 :
        alert('找到了四号')
        break
        case 5 :
        alert('找到了五号')
        break
        default:
          alert('啥也没找到')
    }
  </script>
</body>
</html>